505365506551 has 2 divisors, whose sum is σ = 505365506552. Its totient is φ = 505365506550.

The previous prime is 505365506537. The next prime is 505365506593. The reversal of 505365506551 is 155605563505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505365506551 - 2²¹ = 505363409399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505365506251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252682753275 + 252682753276.

It is an arithmetic number, because the mean of its divisors is an integer number (252682753276).

Almost surely, 2^505365506551 is an apocalyptic number.

505365506551 is a deficient number, since it is larger than the sum of its proper divisors (1).

505365506551 is an equidigital number, since it uses as much as digits as its factorization.

505365506551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1687500, while the sum is 46.

The spelling of 505365506551 in words is "five hundred five billion, three hundred sixty-five million, five hundred six thousand, five hundred fifty-one".